Gearing



Patented July 16, 1929.

UNITED STATES ruina gIEA'r-iin'r ortica- ANDREW R. RIDDERSTROM, OF NAI-IANT, MASSACHUSETTS, ASSIGNOR, BY MESNE AS- SIGNMENTS, TO UNITED SHOE MACHINERY CORIORATION, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

eEARrNe.

Original application ledDecember 9,

In a copending application, Serial No. 521,239, filed December 9, 1921, of which the present application is a division, there is disclosed a skiving machine comprising ation that is herein illustrated and described, the knifeshaft is mounted in a stationary bearing that is, in turn, mounted in a rotatable bearing that is provided with the driving pulley. lThe last-namedbearing is locked to the knife so as to drive the latter, the knife shaft being driven from the knife, and not, as has been customary, hitherto, the knife from the knife shaft. The knife shaft is therefore not subjected to the customary uneven strain encountered in vpresent-daymachines, and the bearings therefore wear down evenly. l l

`With the above and other objects in view, the invention consists of the improved gearing` hereinafter described, illustratedl in the accompanying drawings,and defined inthe appended claims.

In the drawings, Fig. 1 is a fragmentary,

forward part of a machine constructed according to ya preferred embodiment vof the present invention; Fig. 2 is a section taken upon the line 2-2 of Fig. 1, looking in the `tary detail elevation, partly in section along the line 3--3 of Fig. 2, Alooking in the direction of the arrows; and Fig. 4.is a'section In the specific embodiment of the inven-r longitudinal, central, vertical section of the direction of the arrows; Fig. 3 is a fragmen- Y 1921, Serial No. 521,239. Divided and this application led January 4, 1924. Serial No. 684,436.

about a rod 164 so as to provide for skiving scarfs of different angle in the margin of .the material. The angular adjustment of the knife bracket may be effected through a finger or lug 188, that projects from the knife-carrying bracket 170, and that is yieldingly engaged by a dog 17 through the action of a spring 189. The spring 189 thus tends to maintain the lug 188 in engagement with an adjustable limiting stop 190, the adjusted positions `of which determine the an-V gular adjustment of the knife. This adjustment, which is fully explained in the aboveentitled application, is not further illustratedv herein, because not necessary to an understanding of the present invention. The knife is directly Ydriven from a'belt 1 that exerts a force upon the knife shaft in the same angular direction as the spring 189. The feed roll and the feed disk are driven fromI a feed shaft 32. The details of the feed-driving mechanism Vmay be found described in the above-mentioned application. The knife-driving mechanism will now be explained.

A flanged collar 188V is fastened in any well lknown manner to the lower endof a knife shaft 181. The knife 185 is secured to the flange of the collar by means of a clamp screw or the like 186, and relative rotative movement of the knife andthe collar is prevented by a dowel pin 145. The upper end of the knife sha-ft is provided with a worm 182. This Worm meshes with the worm-gear portion 161 of an elongated gear memberv 163 that is freely rotatable upon the stationary rod 164. The worm-gear portion 161 of the 4gear member 163, with which the worm' 182 meshes, is at .the rear of this gear member 163, as will be understood from an inspection of Fig. 4. The gears 161 and 182 are maintained in meshing engagement irrespective of the angularly adjusted position of the bracket 170 and the skiving knife 185 that is carried thereby. The front portion 165 of the gear member 163 constitutes a spiral gear that meshes with a spiral gear 162, shown to the right of the feed-shaftbearing 27 in F ig. 1. The gear 162 is mounted upon a hollow shaft 2 through which the feed Shaft 32 eX- tends. The hollow shaft is freely rotatable with respect to the feed shaft 32, but the two shafts are adapted to be clutched together,

to rotate as a unit, as described in the above idei'itiiied application. rllhe knife shaft 181 is thus adapted to drive the feed roll 95 and the feed disk 143, through the gears 182, 168 and 162.

rllhe dimensions of the gears 182, 163 and 162, as will be clear from the drawings, are such that the gear 182 may operate at comparatively high speed while the gear 162 is operating at comparatively low speed. By running the knife shaft 181 originally at high speed, through the belt 1, the worm 182 is directly driven at high speed, and stepping down from this high speed to the low speed of the gear 162 is attended with a minimum of noise and without overheating the parts. lt is thus possible to run the machine at as high a speed as is consistent with the strength of the materials employed in building the machine. The speed of the knife may thus be increased to 10,000 revolutions per minute, keeping the rate of feed the same as in the above-mentioned application.

One of the diiiiculties experienced with belt-driven knife shafts of commercial skiving machines has been the tendency of the shaft to veer too much to one side, wearing the shaft bearing unevenly, or semi-oval, in shape, and resulting in looseness and consequent rattling and vibration of the shaft in its bearing. According to the present invention, this diiiculty is eliminated by protecting the knife shaft against direct thrust from the belt. The knife shaft`181 is mounted in a bearing 180 that is keyed or otherwise firmly mounted in the knife bracket 1.70 at 8. The pulley at that is driven by the belt 1 is loosely mounted about the bearing 180. rlhe pulley ilis therefore not directly connected to the knife shaft, as is customary in skiving machines embodying beltsdriven knives. rlhe pulley is connected or locked directly to the knife 185 instead, so that the knife shaft is driven by the knife instead of, as is usual, the knife by the knife shaft. To this end, Vthe sleeve 5 that is integral with the pulley is, in the illustrative machine, shown as oppositely recessed at 6 to receive oppositely disposed, upstanding lugs 7 that are provided upon the flanged knife collar 183. Rotative movement of the pulley is thus necessarily communicated to the knife; and from the knife, thus indirectly, to theknife shaft 181. The knife shaft is thus enabled to rotate freely and smoothly in its bearing 180 without rattling or vibration, and Without wearing any part of the bearing unevenly. rhe recesses 6 are, for convenience, in practice, made a little wider than the lugs?, this introducing .no undesirable effects from back lash, because the knife is always rotatedin the same direction.

The knife is further prevented from rattling or vibrating during its rotative L7anoca movement by the fact that the knife shaft 181 is maintained snugly fitted in its bearing 180 during the rotation of the shaft. As the gear 182 drives the gear-member 163, it is obvious, from the angle of the worm threads shown, that theV shaft 181 will be maintained in raisedposition during the rotation of the shaft. A conical projection 8 of the shaft will thus be maintained in snug engagement with a conically enlarged recess 9 of the bearing. l/lvlhen the shaft 181 is not rotating, it is possible for it to drop slightly in a longitudinal direction from the said raised position, by reason of the back lash of the gears 182 and 161.

rllhe flat, seamless belts of present-day, belt-driven, knives are expensive, and they are mounted over corresponding flat-faced pulleys, to eliminate, as much as possible, the jar and the vibgration effects. The construe` tion of the present invention permits using the ordinary, round, seam belt, the ends of which are connected by a hook or hooks, and the ordinary pulley, shownin Fig. 1, without any jarring or vibration.

For purposes of ready assembly, the bearing 180 is provided with an annular shoulder 10 upon which rests the pulley 4, the pulley being confined between the shoulder and a wall 11 of the knife bracket 170. A tube 12 serves to conceal the sleeve portion 13 of the pulleyt that overhangs the lower portion of the bearing 180 and the upper portion of the flange 183.

The description of many portions of the machine an understanding of which is not essential to an understanding of the present invention has purposely been omitted, and many parts of the machine have purposely not been illustrated, in order not to distract attention from the features of essential novelty. `Fuller explanation of such portions of the machine will be found in the c0- pending application above referred to. It will be understood that the features of novelty may be embodied in other machines, and in machines of other types, and that modifications may be made by persons skilled in the art without departing from the spirit and scope of the invention, as defined in the appended claims.

What is claimed is:

1. A machine of the class described having, in combination, a stationary bearing having external and internal bearing portions, a` shaft mounted in the bearing and bearing against the internal bearing portion, driving means mounted about the bearing and bearing against the external bearing portion, and means connecting the driving means to the shaft to cause the driving means and the shaft to rotate together when the driving means is effective.

2. A machine of the class described having, in combination, a bearing, a shaft mounted in the bearing and having a gear, a gear meshing with the shaft gear and driven from the shaft gear at a speed lower than the speed of the shaft gear, the shaft having a conically enlarged portion, and the bearing having a conical recess to receive the conically enlarged portion, whereby the shaft is maintained with the conically enlarged portion in tight engagement with the walls of the conical recess during the rotation of the shaft, a pulley mounted about the bearing, and means connecting the pulley to the shaft to cause them to rotatetogether when the pulley is driven. v

3. A machine of the class described having, in combination, a bearing, a shaft mounted in the bearing and having a tool, and a pulley mounted about the bearing and directly connected to the tool, whereby the shaft is driven by the pulley from the tool.

4t. A machine of the class described having, in combination, a bearing, a shaft mounted in the bearing and having a tool, a pulley mounted about the bearing and directly connected to the tool, and a belt for driving the pulley, whereby the shaft is driven by the pulley from the tool.

5. A machine of the class described having, in combination, a bearing, a shaft mounted in the bearing and having a tool, a pulley mounted about the bearing having a recessed sleeve, the tool having a lug adapted to be received in the recess of the sleeve, and a belt for driving the pulley.

6. A machine of the class described having, in combination, a bearing having an annular shoulder and an enlarged recess, a shaft mounted in the bearing having an enlarged portion received within the recess, and a driving element mounted about the bearing and connected to the shaft.

7. A machine of the class described having, in combination, a bearing having an annular shoulder and a conical recess, ashaft mounted in the bearing having a conically enlarged portion received within the recess, the shaft having a tool, and a pulley mounted about the bearing and directly connected to the tool, whereby the shaft is driven from' the tool. n

8. A machine of the class described having, in combination, a stationary bearing, a shaft mounted in the bearing, a tool mounted on the shaft'so that the tool and the shaft shall rotate together, driving means mounted about the bearing, andv mean connecting the driving means to the tool to cause the driving means, the tool and the shaft to rotate together when the driving means is effective.

9, A machine of the class described having, in combination, a stationary bearing having an external bearing portion and a conically enlarged internalV bearing port-ion, a shaft mounted in the bearing having a conically enlarged portion bearing against the conically enlarged internal bearing portion, the shaft being free to move slightly in a longitudinal direction in the bearing, means for maintaining the shaft with the conically enlarged portion in tightengagement with the conically enlarged internal bearing portion during the rotation of the shaft, driving means mounted about the bearing and bearing against the external bearing portion, and means connecting the driving means to the shaft to cause them to rotate together when the driving means is driven.

10. A machine of the class described having, in combination, a stationary bearing having external and internal vbearing portions, a shaft mounted in the bearing and bearing against the internal bearing portion, the shaft being normally free to move slightly in a longitudinal direction in the internal bearing portion, driving means mounted. about the kbearing and bearing aga-inst the external bearing portion, means connecting `the driving means to the shaft to cause the driving means andthe shaft to rotate together when the driving means is effective, means driven from the shaft, and

means connect-ing the shaft and the drivenv means adapted to prevent the shaft from moving. longitudinally in the internal bearing during the rotation of the shaft. n

In testimony whereof, I have hereunto subscribed my name this 28th day of December, 1923.

ANDREW n. RiDnEnsTnoM. 

